Kanto Kusatsu, Gunma
Kusatsu Onsen Hotel Village
草津温泉 ホテルヴィレッジ
Name in Japanese. Look for this on the sign, or show it to a taxi driver.
Allowed with conditionsStated by the facility
Onsen hotel or inn. Hot spring (spring details not checked)

Tattoo rule
Allowed with conditionsStated by the facility
What the official page says
However, guests with small tattoos that can be completely covered with stickers may use the facilities. Stickers for covering tattoos are available for purchase at reception and the Therme Therme reception desk.
In short: Small tattoos that can be completely covered with the hotel's stickers are allowed.
Where it is
Kanto region, Gunma prefecture. About 148 km in a straight line from Tokyo.
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Rules can change. Check the official page on the day you go. Any paid link is labelled next to the button. We have not visited this bath ourselves.